You have addressed different problems in this one thread and it isunclear to which problem you are currently having problems. You havenot provided any of your code so I cannot say why you are gettingerror messages. I obviously don't have a problem with the code that Isent.

If you are putting multiple Manipulate statements in the same notebookthat use the same symbol names they are probably interacting with eachother. Use Module inside each Manipulate to constrain the scope ofdefinitions, or use different symbol names in the different Manipulatestatements.